An adversary may try certain common or default usernames and passwords to gain access into the system and perform unauthorized actions. An adversary may try an intelligent brute force using empty passwords, known vendor default credentials, as well as a dictionary of common usernames and passwords. Many vendor products come preconfigured with default (and thus well-known) usernames and passwords that should be deleted prior to usage in a production environment. It is a common mistake to forget to remove these default login credentials. Another problem is that users would pick very simple (common) passwords (e.g. "secret" or "password") that make it easier for the attacker to gain access to the system compared to using a brute force attack or even a dictionary attack using a full dictionary.

https://capec.mitre.org/data/definitions/70.html

Related CWE definitions

The product does not have a mechanism in place for managing password aging.
The product supports password aging, but the expiration period is too long.
The use of single-factor authentication can lead to unnecessary risk of compromise when compared with the benefits of a dual-factor authentication scheme.
The use of password systems as the primary means of authentication may be subject to several flaws or shortcomings, each reducing the effectiveness of the mechanism.
The product does not require that users should have strong passwords, which makes it easier for attackers to compromise user accounts.
A protection mechanism relies exclusively, or to a large extent, on the evaluation of a single condition or the integrity of a single object or entity in order to make a decision about granting access to restricted resources or functionality.
The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
The product contains hard-coded credentials, such as a password or cryptographic key.
Please note that CAPEC definitions are provided as a quick reference only. Visit http://capec.mitre.org/ for a complete list of CAPEC entries and more information.
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